I just got mine yesterday, and my first workout with this gadget was a disaster: the HR sensor was at 70 bpm while my actual rate was anywhere between 130 - 140. not once it gave the right values. Moreover, while I was doing chi kung abdominal breathing, goin one respiration per minute max, it was showing 16 - 17 rpm!!! I don't know what's going on, but I'm thinking about returning this gadget.
